Happy Grundsaudaag! The ancient Germanic history of Groundhog Day

You say Groundhog Day, I say Grundsaudaag: how German and Swiss settlers in Pennsylvania created a new language – and a much-loved American holiday.

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Every 2 February since at least 1886, people have been gathering in the Pennsylvanian town of Punxsutawney to watch a groundhog – a furry rodent – crawl out of a hole after its winter sleep. If the day is sunny and the groundhog sees its own shadow, there will be six more weeks of cold weather, according to legend – but if it's a cloudy day, and there is no shadow, spring has arrived. Across the US, the quirky tradition is known as Groundhog Day. But among its original celebrants, it has a different name: Grundsaudaag.

https://www.bbc.com/future/article/20240131-how-the-pennsylvania-dutch-created-groundhog-day